PCF85363ATLSLASHAX datasheet(13/86 Pages) NXP

13 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

aaa-009580

SECONDS

100 Hz tick

MINUTES

HOURS

12_24

DAYS

WEEKDAY

LEAP YEAR

CALCULATION

MONTHS

YEARS

100TH_SECOND

100TH

1 Hz tick

Figure 9. Data flow for the time function

During read operations, the time counting circuits (memory locations 00h through 07h)

are copied into an output register. The RTC continues counting in the background.

When reading or writing the time it is very important to make a read or write access in

one go, that is, setting or reading 100th seconds through to years should be made in

one single access. Failing to comply with this method could result in the time becoming

corrupted.

As an example, if the time (seconds through to hours) is set in one access and then in

a second access the date is set, it is possible that the time increments between the two

accesses. A similar problem exists when reading. A roll-over may occur between reads

thus giving the minutes from one moment and the hours from the next.

Before setting the time, the STOP bit should be set and the prescalers should be cleared

(see Section 7.16).

An example of setting the time: 14 hours, 23 minutes and 19 seconds.

• I2C START condition

• I2C slave address + write (A2h)

• register address (2Eh)

• write data (set STOP, 01h)

• write data (clear prescaler, A4h)

• write data (100th seconds, 00h)

• write data (Hours, 14h)

• write data (Minutes, 23h)

• write data (Seconds, 19h)

• I2C START condition

• I2C slave address + write (A2h)

PCF85363A

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Product data sheet

Rev. 3.1 — 18 June 2021

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